Malicious PDF — malware analysis report

Static analysis result for SHA-256 040a7a42205b9fc1…

MALICIOUS

PDF

87.2 KB Created: 2021-07-15 23:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 15aa091dcd92cb6474145f9ba9d0357f SHA-1: 0f94d8f46b4f6fca4308097f5d173efa91bf93e0 SHA-256: 040a7a42205b9fc166030cc2f9ac2c9da8a00335c59872a080bd832390662dee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous external URLs, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=powers+of+central+government PDF link annotation
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78976702621.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/62484039516.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/vodigo.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/rowaf.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/72a47e90a18656f47880cd0f6b8f1225/22129138268.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ab31955ad1a---27965879625.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/73b35d77444ef73411caddf144d55fb0/jopasat.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609e236ca775d---kurelumowojafugule.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/43383192491.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/pozoginalikugu.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-04/images/files/18145931049.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/wololadojuvadutora.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6370c24fc---pefakiv.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/69691855792.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/38955427517.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e52512e5dd---dezitaxixunafejakize.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4333acc1---sovora.pdfIn PDF document text
    • https://btegypt.com/file/68636819753.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/193330714.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/14al8mhqhmde1kd4cjtd9gofm0/xevajopowowimawe.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///17482425160.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608705862ff35---388220430.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5776f14066f8602e9381ee88ff2a49c1/zuzopasupaxazedubarafipav.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 17364 bytes
SHA-256: 907d9f0b6a77e9e2fa53b934fd7e7d9ba63fb71bd024149997e1c765012db95e
font_01_sfnt_off00011e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B5 10740 bytes
SHA-256: a6c4b695677b481435fc11fb2a2233392418e61e0b470e0bcfb9d6328a099b30

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